Characterization of pack cemented Ni(2)Al(3 )coating exposed to KCl(s) induced corrosion at 600 degrees C
Journal article, 2018
Oxidation of Ni2Al3 produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm(-2) KCl(s) deposit in an environment containing 5% O-2, 40% H2O and 55% N-2 at 600 degrees C for up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni2Al3 shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50-250 nm thick nodules form that are enriched in K, O and Al.
KCl
Nickel aluminide
high temperature corrosion
electron microscopy
600 degrees C
Author
K. V. Dahl
Technical University of Denmark (DTU)
Andreas Slomian
Chalmers, Chemistry and Chemical Engineering, Energy and Material
T. N. Lomholt
Technical University of Denmark (DTU)
FORCE Technology
S. Kiamehr
Technical University of Denmark (DTU)
F. B. Grumsen
Technical University of Denmark (DTU)
M. Montgomery
Technical University of Denmark (DTU)
Torbjörn Jonsson
Chalmers, Chemistry and Chemical Engineering, Energy and Material
Materials at High Temperatures
0960-3409 (ISSN)
Vol. 35 1-3 267-274Subject Categories
Manufacturing, Surface and Joining Technology
Materials Chemistry
Corrosion Engineering
DOI
10.1080/09603409.2017.1392112